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  <title>释放查询结果占用的内存</title>

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</div><hr /><div id="function.pg-free-result" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">pg_free_result</h1> 
    <p class="verinfo">(PHP 4 &gt;= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_free_result</span> &mdash; <span class="dc-title">释放查询结果占用的内存</span></p>

   </div>
 <div class="refsect1 description" id="refsect1-function.pg-free-result-description">
  <h3 class="title">说明</h3>
     <div class="methodsynopsis dc-description">
      <span class="type">bool</span> <span class="methodname"><strong>pg_free_result</strong></span>
       ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
      )</div>

    <p class="para rdfs-comment">
     <span class="function"><strong>pg_free_result()</strong></span> 仅在当你担心脚本执行时占用了过多内存时调用。脚本执行完毕后所有的查询结果占用的内存都会被自动释放。不过如果你确认在脚本中不会再用到查询结果了，你可以用 <em><code class="parameter">result</code></em> 作为参数调用 <span class="function"><strong>pg_free_result()</strong></span> 来释放有关的内存。成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
    </p>
    <blockquote class="note"><p><strong class="note">Note</strong>: 
     <p class="para">
      本函数以前的名字为 <em>pg_freeresult()</em>。
     </p>
    </p></blockquote>
    <p class="para">
     参见 <span class="function"><a href="function.pg-query.html" class="function">pg_query()</a></span>。
    </p>
   </div>


 <div class="refsect1 parameters" id="refsect1-function.pg-free-result-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">result</code></em></dt>

     <dd>

      <p class="para">
       PostgreSQL query result resource, returned by <span class="function"><a href="function.pg-query.html" class="function">pg_query()</a></span>,
       <span class="function"><a href="function.pg-query-params.html" class="function">pg_query_params()</a></span> or <span class="function"><a href="function.pg-execute.html" class="function">pg_execute()</a></span>
       (among others).
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.pg-free-result-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.pg-free-result-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2039">
    <p><strong>Example #1 <span class="function"><strong>pg_free_result()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$db&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=users&nbsp;user=me"</span><span style="color: #007700">)&nbsp;||&nbsp;die();<br /><br /></span><span style="color: #0000BB">$res&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;1&nbsp;UNION&nbsp;ALL&nbsp;SELECT&nbsp;2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$val&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pg_fetch_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #DD0000">"First&nbsp;field&nbsp;in&nbsp;the&nbsp;second&nbsp;row&nbsp;is:&nbsp;"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$val</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">pg_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
First field in the second row is: 2
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.pg-free-result-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.pg-query.html" class="function" rel="rdfs-seeAlso">pg_query()</a> - 执行查询</span></li>
    <li class="member"><span class="function"><a href="function.pg-query-params.html" class="function" rel="rdfs-seeAlso">pg_query_params()</a> - Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text.</span></li>
    <li class="member"><span class="function"><a href="function.pg-execute.html" class="function" rel="rdfs-seeAlso">pg_execute()</a> - Sends a request to execute a prepared statement with given parameters, and waits for the result.</span></li>
   </ul>
  </p>
 </div>

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